UnbelievabLS1

iTrader: (5)

A friend of mine just found a needle bearing in his oil recently when he was changing it. It's obviously from a rocker arm. My question is this, once he finds the faulty rocker arm, can he just replace that one, or does he need to replace all 16?

Thanks in advance for any help given. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Pro Stock John

iTrader: (34)

Just the one is okay...

KevinTernes

Hey UnbelievabLS1,
You didn't have to post this question for me--I just came over here to do it myself. Thanks!

Here's another question:
If I only replace one rocker arm, how do I go about torqueing the one nut down?

The service manual gives a procedure for torqueing all 16 involving putting #1 at TDC and so on. Do I need to loosen all 16 and follow the service manual procedure? Or...?

Thanks.

DBerry

No just torque the one. The point of using that sequence is to make sure the lifter is on the base circle of the cam. Another way to do this is to turn the crank with a wrench until the pushrod starts to come up, then turn it one revolution. This way you know the lifter is on the base circle.

66LS1NOVA

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by UnbelievabLS1:
<strong>A friend of mine just found a needle bearing in his oil recently when he was changing it. It's obviously from a rocker arm. My question is this, once he finds the faulty rocker arm, can he just replace that one, or does he need to replace all 16?

Thanks in advance for any help given. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">IF THE CAR YOU ARE WORKING ON IS BY ANY CHANCE UNDER WARRANTY, TAKE IT BACK TO THE DEALERSHIP AND THEY WILL REPLACE ALL 16 FOR YOU, GM HAS A SERVICE BULLETIN PERTAINING TO THIS EXCACT PROBLEM THAT YOU ARE FACING AND REPLACES ALL 16, AS FAR AS IF IT IS OUT OF WARRANTY ITS UP TO YOU WETHER OR NOT YOU WANT TO CHANCE IT WITH JUST ONE ROCKER. I DONT KNOW THE CAUSE OF THE BEARINGS COMING OUT BUT I CAN LOOK AT WORK TOMMOROW AND LET YOU KNOW, HOPE THIS HELPS <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

66LS1NOVA

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by KevinTernes:
<strong>Hey UnbelievabLS1,
You didn't have to post this question for me--I just came over here to do it myself. Thanks!

Here's another question:
If I only replace one rocker arm, how do I go about torqueing the one nut down?

The service manual gives a procedure for torqueing all 16 involving putting #1 at TDC and so on. Do I need to loosen all 16 and follow the service manual procedure? Or...?

Thanks.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">THE PROCEDURE YOU ARE TALKING ABOUT APPLIES TO THE LT1 NOT THE LS1 LT1'S ARE SET TO ZERO LASH AND LS1'S ARE TORQUED TO 20LBFT AND TURN THE MOTOR OVER ONCE AND RETOURQUE TO 25LBFT HOPE THIS HELPS <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />